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Two bacterial strains isolated from a Zn-polluted soil enhance plant growth and mycorrhizal efficiency under Zn-toxicity


, : Two bacterial strains isolated from a Zn-polluted soil enhance plant growth and mycorrhizal efficiency under Zn-toxicity. Chemosphere 62(9): 1523-1533

In this study we investigated the interactions among plant, rhizosphere microorganisms and Zn pollution. We tested the influence of two bacterial strains isolated from a Zn-polluted soil on plant growth and on the symbiotic efficiency of native arbuscular mycorrhizal fungi (AMF) under Zn toxicity. The two bacterial strains exhibited Zn tolerance when cultivated under increasing Zn levels in the medium. However, strain B-I showed a higher Zn tolerance than strain B-II at the two highest Zn levels in the medium (75 and 100 mg l-1 Zn). Molecular identification placed the strain B-I within the genus Brevibacillus. Our results showed that bacterial strain B-I consistently enhanced plant growth, N and P accumulation, as well as nodule number and mycorrhizal infection which demonstrated its plant-growth promoting (PGP) activity. This strain B-I has been shown to produce IAA (3.95 micro g ml) and to accumulate 5.6% of Zn from the growing medium. The enhanced growth and nutrition of plants dually inoculated with the AMF and bacterium B-I was observed at three Zn levels assayed. This effect can be related to the stimulation of symbiotic structures (nodules and AMF colonization) and a decreased Zn concentration in plant tissues. The amount of Zn acquired per root weight unit was reduced by each one of these bacterial strains or AMF and particularly by the mixed bacterium-AMF inocula. These mechanisms explain the alleviation of Zn toxicity by selected microorganisms and indicate that metal-adapted bacteria and AMF play a key role enhancing plant growth under soil Zn contamination.

US$19.90

PMID: 16098559

DOI: 10.1016/j.chemosphere.2005.06.053


Other references

Taylor D.P.; Allen L.E.; Ashworth E.M.; Becker J.A.; Hyslop D.K.; Riblet L.A., 1981: Treatment with trazodone plus phenoxybenzamine accelerates development of decreased type 2 serotonin binding in rat cortex. Combined administration of phenoxybenzamine with the antidepressant trazodone for 4 days produced a decrease in rat cerebral cortical type 2 serotonin binding as measured with [3H]spiperone. Trazodone alone had no effect on type 2 serotonin bindin...

Rieske E., 1975: Effect of calcium ion on trans synaptic transfer of protein precursors in electrically coupled nerve cells. Experimental Brain Research 23(SUPPL): 175

Wileman, L.; May, C.; Chew-Graham, C.A., 2002: Medically unexplained symptoms and the problem of power in the primary care consultation: a qualitative study. Patients presenting in primary care frequently exhibit physical symptoms that may be unrelated to organic pathology. Such symptoms are commonly regarded as products of psychological or emotional problems, and their legitimacy as 'medical&apos...

Zhao, C.; Zhao, P.; Feng, B.; Hou, X.; Zhao, L., 2017: Discovery and Synthesis of Amino Acids Modified Deoxycholic Acid Derivatives and in Vitro Antiproliferative Evaluation. A series of deoxycholic acid (DCA) derivatives bearing amino acid moiety has been synthesized and investigated for their potential antiproliferative activities. DCA derivative compounds were synthesized by a two or three step synthetic approach. T...

Remsen, J.V.Jr; Brumfield, R.T., 1998: Two new subspecies of Cinnycerthia fulva from the southern Andes. Analysis of geographic variation of plumage pattern and color within Cinnycerthia fulva (Troglodytidae) of the southern Andes revealed that this taxon, formerly treated as monotypic, consists of three discrete units. We describe two new subspecies...

Chombart D.Lauwe, Jean., 1961: The Soviet peasants. This general study of agriculture in the Soviet Union is based on two personal trips (1955, 1960) and the study of numerous documents. The author presents a detailed analysis of the kolkhoz, of the machine stations and of the sovkhoz or 'agri...

Hartwick R.A., 1983: High performance liquid chromatographic separation of oligo nucleotides and other nucleic acid constituents on multi functional stationary phases. Journal Of Chromatography: 28

Brooke, A., 2007: Dasypolia templi - the study of the brindled ochre moth in the Huddersfield area. Yorkshire Naturalists Union Bulletin, 47: 1-5

Nielsen, A., 2016: Concept-Based Learning in Clinical Experiences: Bringing Theory to Clinical Education for Deep Learning. Concept-based learning is used increasingly in nursing education to support the organization, transfer, and retention of knowledge. Concept-based learning activities (CBLAs) have been used in clinical education to explore key aspects of the patien...

Bernard, C., 1924: Report of the General Tea Experiment Station for l923. In 1923 only a few estates suffered serious damage by Helopeltis. The planting of green manures on a large scale seems to be the best measure against this pest. Besides the Nematode parasite already recorded, there is also a Hymenopterous parasite...